大气二氧化碳浓度升高对农田土壤硝化作用的影响  

Effects of elevated atmospheric carbon dioxide concentration on nitrification of farmland soil

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作  者:杜颐林 梁嘉斌 郭心雨 罗继鹏 刘苑坤 牟鲯璃 李廷强[1,2] DU Yilin;LIANG Jiabin;GUO Xinyu;LUO Jipeng;LIU Yuankun;MU Qili;LI Tingqiang(Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health,College of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310058,China;Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment,Hangzhou 310058,China)

机构地区:[1]浙江大学环境与资源学院,污染环境修复与生态健康教育部重点实验室,杭州310058 [2]浙江省农业资源与环境重点实验室,杭州310058

出  处:《浙江大学学报(农业与生命科学版)》2022年第4期504-516,共13页Journal of Zhejiang University:Agriculture and Life Sciences

基  金:National Key Research and Development Programs of China (2017YFD0200102)。

摘  要:高浓度二氧化碳(elevated carbon dioxide concentration,eCO_(2))对土壤氮循环的影响已被广泛报道,其中硝化作用在净初级生产力和温室气体排放中起着重要作用。然而,土壤硝化作用和氨氧化微生物对eCO_(2)的响应规律并不确定。为了研究eCO_(2)对农田生态系统中硝化作用的影响及其潜在的微生物学机制,我们进行了一项全球性的meta分析。结果表明,eCO_(2)显著提高了农田土壤硝化潜势(potential nitrification rate,PNR)、氧化亚氮(N_(2)O)排放量和氨氧化细菌(ammonia-oxidizing bacteria,AOB)丰度。气候、试验条件、土壤性质和田间管理是调控PNR对eCO_(2)响应的重要因素。PNR的响应与AOB丰度呈显著正相关,而与氨氧化古菌(ammonia-oxidizing archaea,AOA)丰度无显著相关性;AOB丰度对eCO_(2)响应与土壤硝化作用的关系比环境和试验因素以及管理措施的关系更密切。此外,土壤类型和CO_(2)浓度升高幅度也决定着AOB丰度的响应。总之,在农田生态系统中,eCO_(2)通过增加AOB数量来加速土壤硝化过程。It has been widely reported that elevated carbon dioxide concentration(eCO_(2))affects soil nitrogen cycling dramatically,in which nitrification plays an important role in net primary productivity and greenhouse gas emission.However,the general patterns of soil nitrification and ammonia oxidizers in response to eCO_(2) remain uncertain.Here we performed a global meta-analysis to explore the effects of eCO_(2) on soil nitrification in agroecosystems and underlying microbial mechanisms.Our results showed that eCO_(2) significantly increased potential nitrification rate(PNR),nitrous oxide(N_(2)O)emission and ammonia-oxidizing bacteria(AOB)abundance.Climates,experimental conditions,soil properties and agricultural practices were important factors in regulating the responses of soil nitrification to eCO_(2).The responses of nitrification potential were positively correlated with AOB abundance,while no evidence was found for ammonia-oxidizing archaea(AOA)abundance.The eCO_(2) response of AOB abundance was more closely related to the responses of soil nitrification than a wide range of environmental and experimental factors,as well as management practices.Furthermore,various effects of eCO_(2) on AOB abundance were determined by soil type and CO_(2) increase magnitude.Collectively,our results suggest that eCO_(2) strengthens soil nitrification by increasingAOB populations in agroecosystems.

关 键 词:农田土壤 AMOA基因 高浓度二氧化碳 META分析 硝化作用 

分 类 号:S154[农业科学—土壤学]

 

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